Trigger is one of the henchmen to The Sheriff of Nottingham. Trigger wears a metal helmet with a purple cloak and carries a crossbow, which he often refers to as "Ol Betsy".
While both he and Nutsy are fairly dimwitted, Trigger is slightly more competent and more perceptive that his comrade. He's also much crueler than the fairly (for a villain) sweet-natured Nutsy. However, he is known for his itchy trigger finger, which often results in his crossbow accidentally firing.
Trigger is first seen during Prince John's archery tournament. Trigger mans a pie sales booth, while Nutsy helps the Sheriff cheat during the tournament. During the following battle, Trigger attempts to fight using his crossbow, but the arrow ricochets and he is forced to duck to avoid it. He is then hit by a well-aimed pie courtesy of Maid Marian.
Later, Trigger accompanies the Sheriff as he arrests Friar Tuck. Trigger in particular assists by pulling down the hood of Friar Tuck, who is engaged in battle with the Sheriff. The Friar's view blocked, the Sheriff is able to chain up Friar Tuck with little trouble. When Robin Hood, disguised as a blind beggar, comes to get information, he and Nutsy are fooled. Despite Trigger's constant warnings to hush, Nutsy blabs a plan to capture Robin Hood by hanging Friar Tuck. Trigger grows suspicious of how much the "beggar" knows, but the Sheriff blows off his concerns.
Trigger is shown as (correctly) fearing a jailbreak, and alongside the Sheriff, is shown investigating a disturbance. While they believe it to only be Nutsy, it is actually a disguised Robin Hood. Trigger later attempts to raise the alarm, after hearing Robin Hood open the jail door, but is ignored by the annoyed Sheriff. Trigger is warned against further "false alarms", and is ordered to return to his patrol.
Trigger later hears a muffled sound and approaches the Sheriff to tell his suspicions, only to realize that the "Sheriff" is actually Little John in disguise (having subdued the Sheriff). He is immediately subdued by Little John so the prisoners can escape.
Trigger and Nutsy are seen at the end of the film, apparently reformed by King Richard. They are shown guarding the imprisoned Prince John, Sir Hiss, and the Sheriff. When the newlywed Robin Hood and Maid Marian pass by in their carriage, Nutsy orders Trigger to "present arms" which leads Trigger to accidentally fire his crossbow.